Class / Patent application number | Description | Number of patent applications / Date published |
417540000 | Having pulsation dampening fluid receiving space | 38 |
20080232989 | Regulator flow noise prevention for fuel system of a vehicle - Vapor reducing structure ( | 09-25-2008 |
20080292483 | Gas Volume Damping Device for Damping Discharge Pulsations in a Medium Being Pumped - The invention relates to a device for damping discharge pulsations in a medium being pumped through a system of pipes in a pulsating manner by a displacement pump that operates with a specific discharge characteristic, which device at least comprises a housing with an at least partially gas-filled damping chamber having a certain volume present therein, which housing can be connected to the system of pipes, in such a manner that an interface layer is present between the medium and the gas in the damping chamber during operation, which damping chamber has a desired gas pressure characteristic that partially depends on the discharge characteristic of the displacement pump, wherein the gas volume that is present in the damping chamber varies in time between a minimum compression volume and a maximum expansion volume under the influence of said discharge pulsations during operation, as well as adjusting means that supply gas to or discharge gas from the damping chamber The present invention provides a simpler and less complicated construction both for pulsation dampers provided with a separating element and for air boxes not provided with a separating element. In order to achieve an optimised damping of the discharge pulsations, the adjusting means are according to the invention arranged for determining the desired gas pressure characteristic in the damping chamber on the basis of the discharge characteristic of the displacement pump and determining the current gas pressure characteristic in the damping chamber, and comparing the current gas pressure characteristic as determined with the desired gas pressure characteristic of the damping chamber and determining the current position of the interface layer in the damping chamber on the basis of said comparison. | 11-27-2008 |
20080317618 | PULSATION PRESSURE DECREASED TYPE PUMP FOR VEHICLE SLIP CONTROL SYSTEM - The present invention provides a pulsation pressure decreased type pump. When an oil pump that is driven by a motor during the operation of an electronically controlled brake system discharges a working fluid, the working fluid passes through an annular orifice provided at a position where the working fluid is discharged and is then discharged to an outlet of a pump housing through an outflow channel formed in the orifice so as to decrease a pulsating pressure using a piston reciprocated by a cam. Therefore, it is possible to decrease a pulsating pressure generated in the pump from 20 bar to 5 bar or less. | 12-25-2008 |
20090068041 | Low Back-Flow Pulsation Fuel Injection Pump - A fuel pump assembly includes a pump bushing defining a dual-chambered pumping cavity, a fluid channel for shuttling fuel between the chambers, a plunger, and a plurality of fluid control valves. A first check valve is a pressure relief valve in fluid communication with an outlet of the pump bushing and with either an inlet of a second check valve or an inlet of the pump bushing. Another check valve or a control orifice may be used in parallel with the second check valve, with the third check valve or control orifice being positioned at least partially external to the fuel pump assembly. A vehicle includes a transmission, engine, a returnless high-pressure fuel pump assembly, and a low-pressure fuel line in fluid communication with an inlet side of an inlet control valve. The high-pressure fuel pump assembly inhibits a pressure pulsation from propagating through the low-pressure fuel line. | 03-12-2009 |
20090155108 | HYPERBOLIC HORN FOR PULSATION FILTER DEVICE USED WITH GAS COMPRESSOR - A method and system for reducing pulsation in a gas compressor system. A side branch absorber, which may be installed on the lateral piping of either the suction or discharge side of the cylinders, has a hyperbolic horn at the input end. | 06-18-2009 |
20090185922 | FUEL PUMP - A fuel pump includes a housing having therein a suction passage and a pressurization chamber into which fuel from the suction passage flows, a plunger held in the housing to be reciprocable so as to pressurize the fuel flowing into the pressurization chamber, and a diaphragm device located in a suction chamber that is provided in the suction passage. The diaphragm device includes a pair of first and second diaphragms that are arranged to define an inner space therebetween and air-tightly sealed at its entire peripheries. A mass addition member may be attached to an inside surface of at least one of the first and second diaphragms, so that the first and second diaphragms with the mass addition member have different characteristic frequencies. Accordingly, pressure pulsation of the fuel in the suction chamber can be effectively reduced by the pulsation damper. | 07-23-2009 |
20090191076 | TUNABLE CHOKE TUBE FOR PULSATION CONTROL DEVICE USED WITH GAS COMPRESSOR - A method and system for reducing pulsation in a gas compressor system. A pulsation control device, such as a filter bottle or side branch absorber, is installed at a port into some location on the compressor system. The pulsation control device has a choke tube with a variable cross-sectional area, such as by having multiple conduits that may be opened or closed or a diameter that may be varied. In operation, the cross sectional area of the choke tube is varied depending on the compressor speed. | 07-30-2009 |
20090196778 | LIQUID DISCHARGE CONTROL APPARATUS - In a liquid discharge control apparatus which uses a piezoelectric type diaphragm pump, an accumulator having a liquid accumulation cavity and a movable member is communicated to an outlet of the diaphragm pump. In discharge operation of the diaphragm pump, a quantity of the liquid in the liquid accumulation cavity is rapidly increased, and the movable member is elastically deformed so as to increase of the volume of the liquid accumulation cavity. Alternatively, in suction operation, when a back stream of the liquid occurs, the quantity of the liquid in a path communicated to the outlet of the diaphragm pump is decreased due to the back stream. The decrease of the liquid can be compensated by the decrease of the volume of the liquid accumulation cavity of the accumulator. Thereby, variation of the quantity of the liquid discharged from the outlet of the accumulator is reduced and the liquid can be discharged, smoothly. | 08-06-2009 |
20100129250 | Auxiliary energy-accumulation and flow-enhancement device for hydraulic system of concrete pump - An auxiliary energy-accumulation and flow-enhancement device for a hydraulic system of a concrete pump is provided. The device includes a connection oil passage | 05-27-2010 |
20100166586 | HERMETIC COMPRESSOR - A hermetic compressor having an improved refrigerant discharge path to efficiently reduce pulsation of a refrigerant to be discharged. The hermetic compressor includes a frame, a cylinder provided at one side of the frame and having a compression chamber, a cylinder head coupled to the cylinder so as configured to hermetically seal the compression chamber and having a refrigerant discharge chamber to receive a refrigerant discharged from the compression chamber, a damping discharge chamber provided at the other side of the frame configured to reduce pressure pulsation of the refrigerant having passed through the refrigerant discharge chamber, a discharge guide path formed in the frame connecting the refrigerant discharge chamber and the damping discharge chamber, a discharge pipe having an entrance end connected to the damping discharge chamber so as to guide the refrigerant, having passed through the damping discharge chamber, to outside of the hermetic compressor, and an extension tube provided in the damping discharge chamber. The extension tube has an entrance end connected to an exit end of the discharge guide path, an exit end being spaced apart from an entrance end of the discharge pipe, and at least a portion of the extension tube being bendable. | 07-01-2010 |
20100209274 | DAMPER DEVICE AND HIGH PRESSURE PUMP HAVING THE SAME - In a housing, a damper member is placed in a fluid chamber communicated with a pressurizing chamber, at which a plunger is reciprocated to pressurize fuel, and an opening of the fluid chamber is covered with a cover member. The damper member includes first and second-side diaphragms. A first-side support member is located between the damper member and the cover member and is engaged with a first-side outer peripheral portion of the first-side diaphragm and the cover member. A second-side support member is located between the damper member and the housing and is engaged with a second-side outer peripheral portion of the second-side diaphragm and the housing. The first and second-side support members are urged between the housing and the cover member. | 08-19-2010 |
20100215529 | DAMPER DEVICE, HIGH PRESSURE PUMP HAVING THE SAME AND MANUFACTURING METHOD OF THE SAME - Gas of a predetermined pressure, which is equal to or higher than the atmospheric pressure, is filled in a damper chamber of a damper member that includes first and second-side diaphragms. A first-side limiting portion of a first-side cover member and a second-side limiting portion of a second-side cover member are engageable with a first-side concave portion of the first-side diaphragm and a second-side concave portion of the second-side diaphragm, respectively, to limit bulging of the damper member when a pressure of a fluid chamber is equal to or less than the predetermined pressure. | 08-26-2010 |
20100226806 | ACTIVE ELECTRIC ACCUMULATOR - The present invention provides an active, electrically powered hydraulic fluid accumulator. The accumulator includes an electric motor having its output coupled to a mechanical rotation to linear translation transducer such as a lead screw, ball spline or similar device. The output of the mechanical transducer is coupled to a piston disposed within an accumulator cylinder. The accumulator cylinder preferably communicates with a pair of inlet and outlet check valves disposed in hydraulic supply and feed lines from the system pump or sump and to the system, respectively. | 09-09-2010 |
20110103985 | FUEL PUMP WITH AN IMPROVED DAMPING DEVICE FOR A DIRECT INJECTION SYSTEM - A fuel pump for a direct injection system having: at least one pumping chamber; a piston which is mounted sliding inside the pumping chamber in order to vary cyclically the volume of the pumping chamber; an intake duct connected to the pumping chamber and regulated by an inlet valve; a delivery duct connected to the pumping chamber and regulated by a one-way delivery valve which allows exclusively a fuel flow outgoing from the pumping chamber; and a damping device, which is placed along the intake duct upstream of the inlet valve, and comprises at least one elastically deformable damping body that has internally a closed chamber filled with pressurized gas and composed of two metal plates cup shaped and welded together at their annular edges by an annular weld without interruptions. | 05-05-2011 |
20110110807 | HIGH-PRESSURE PUMP - A fuel gallery has an inlet opening through which a fuel is introduced therein and a suction opening through which the fuel flows between the fuel gallery and a compression chamber. A pulsation damper is supported in the fuel gallery by a first and a second supporting member. The second supporting member defines an inner fuel chamber and outer fuel chamber which communicates with each other through apertures. The suction opening is located at a side wall of the fuel gallery and the inlet opening is located at a bottom wall of the inner fuel chamber which is defined radially inside of the second supporting member. The fuel discharged into the outer fuel chamber through the suction opening is introduced into the inner fuel chamber through the apertures. A flow velocity of the fuel is decreased and a pressure pulsation reduction effect of the pulsation damper is surely achieved. | 05-12-2011 |
20110110808 | HIGH-PRESSURE PUMP - An extended passage of a press-side passage is supposed in a fuel gallery. This supposed extended passage of the press-side passage extends toward a lid member. The press-side passage is opened at the side wall of the fuel gallery. A center axis of the press-side passage is inclined in such a manner that a fuel returning from the press-side passage to the fuel gallery flows toward the lid member. A bottom-side fringe of a damper unit does not exist in the supposed extended passage. | 05-12-2011 |
20110123376 | High-Pressure Fuel Supply Pump and Discharge Valve Unit Used Therein - A high-pressure fuel supply pump mounted with a discharge valve that can reduce an influence of noise caused by a valve body-circumferential flow and a discharge valve unit used therein. The high-pressure fuel supply pump includes a discharge valve ( | 05-26-2011 |
20110250084 | MUD PUMP MODULES WITH SURGE DAMPENERS - A drilling fluid pumping system including a pump apparatus with a pumping chamber having an inlet valve and an outlet valve and a dampener system in fluid communication with the pumping chamber for damping the flow of fluid, e.g. drilling fluid, This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C. F. R. 1.72(b). | 10-13-2011 |
20120087817 | Three element diaphragm damper for fuel pump - A damper assembly for a fuel pump includes at least one diaphragm assembly formed by joining two metal diaphragms to respective two sides of an imperforate central plate, thereby creating a pair of closely spaced diaphragms, each acting upon its own gas volume. Preferably, the diaphragm assembly has (a) a rigid, relatively thick circular or polygonal central plate, (b) a first circular diaphragm having a rim portion sealingly secured as by welding to the plate and a relatively thin, flexible, convex portion projecting from one side of the plate and defining a first pressurized gas volume, and (c) a second circular diaphragm having a rim portion sealingly secured as by welding to the plate and a relatively thin, flexible, convex portion projecting from the other side of the plate and defining an independent second pressurized gas volume. | 04-12-2012 |
20120189477 | PUMP PULSATION DISCHARGE DAMPENER WITH DUAL PRESSURE DROP TUBE ASSEMBLIES HAVING UNEQUAL SIZES - Different inner diameter internal or external pressure drop tubes or orifice plate openings producing different discharge pressure pulse amplitudes are employed in a pump pulsation control reactive discharge dampener. Either both pressure drop tubes/orifice plates may be mounted concurrently on or in the dampener, connected to different discharge pipes used selectively by the operator depending upon the piston or plunger size being employed, or the pressure drop tubes/orifice plates may be interchangeable. | 07-26-2012 |
20120195778 | HIGH PRESSURE PUMP - A gas chamber is placed adjacent to a variable volume chamber of a high pressure pump. The gas chamber includes an inner blocking wall, which borders on the variable volume chamber and contacts fuel in the variable volume chamber, an outer blocking wall, which is opposed to the inner blocking wall, and gas, which fills a space that is defined between the inner blocking wall and the outer blocking wall. | 08-02-2012 |
20120237378 | SHUNT PULSATION TRAP FOR CYCLIC POSITIVE DISPLACEMENT (PD) COMPRESSORS - A shunt pulsation trap for a cyclic positive displacement (PD) compressor reduces gas pulsation, NVH and improves off-design efficiency without using a traditional serial pulsation dampener and a variable geometry. Generally, a shunt pulsation trap for a cyclic PD compressor is configured to trap and attenuate gas pulsations before discharge and comprises a housing structure having a flow suction port, a flow discharge port, a compressor cavity and a pulsation trap chamber adjacent to the PD compressor cavity, therein housed various pulsation dampening means or pulsation energy recovery means or pulsation containment means, at least one injection port (trap inlet) branching off from the PD compressor cavity into the pulsation trap chamber and a feedback region (trap outlet) communicating with the PD compressor outlet. The associated principles, methods and embodiments are disclosed. | 09-20-2012 |
20120263613 | Piston Pump for a Hydraulic Vehicle Braking System - A piston pump as a return pump of a slip-controlled, hydraulic vehicle braking system is disclosed. There is a mushroom-shaped shut-off body as a spring-loaded outlet valve, the shaft thereof extending through a center hole of a tubular damper piston. The shut-off body is movable transversely to the opening and closing direction thereof, so that said shut-off body aligns with a valve seat upon closing. Upon opening, the damper piston forces brake fluid out of a damping chamber in which it is housed so that an opening movement of the outlet valve is dampened. | 10-18-2012 |
20130052064 | HIGH PRESSURE PUMP - A high-pressure pump has: a plunger; a pump body; a cover member for covering the pump body and forming a fuel chamber; a pulsation damper body constructed of upper and lower diaphragms with their peripheral edge portions joined and for reducing pressure pulsation in the chamber, the upper and lower diaphragms trapping gas having a given pressure between them; an upper support member having an upper ring-shaped part and an upper support body, the upper ring-shaped part being joined to the peripheral edge portion of the upper diaphragm, the upper support body extending from the upper ring-shaped part and abutting on the cover member; and a lower support member having a lower ring-shaped part and a lower support body, the lower ring-shaped part being joined to the peripheral edge portion of the lower diaphragm, the lower support body extending from the lower ring-shaped part and abutting on the pump body. | 02-28-2013 |
20130149177 | Mechanism for Restraining Fuel Pressure Pulsation and High Pressure Fuel Supply Pump of Internal Combustion Engine with Such Mechanism - A mechanism for reducing pressure pulsation includes a pair of metal dampers formed by joining two disk-shaped metal diaphragms over an entire circumference and forming a hermetically sealed space inside a joined portion, with gas being sealed in the aforementioned hermetically sealed space of the damper, has a pair of pressing members which give pressing forces to both outer surfaces of the aforementioned metal dampers at a position at an inner diameter side from the joined portion, and is unitized with the pair of pressing members being connected in a state in which they sandwich the metal damper. | 06-13-2013 |
20130189141 | DAMPENERS FOR PUMPING SYSTEMS - A drilling fluid pumping system including a pump apparatus with a pumping chamber having an inlet valve and an outlet valve and a dampener system in fluid communication with the pumping chamber for damping the flow of fluid, e.g. drilling fluid, This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b). | 07-25-2013 |
20130280112 | High-Pressure Fuel Pump - A high-pressure fuel pump includes a pressurizing chamber for pressurizing fuel, an outlet valve for discharging the fuel pressurized in the pressurizing chamber to an outlet passage, a relief passage for connecting the outlet passage located downstream of the outlet valve and the pressurizing chamber with each other while bypassing the outlet valve. A relief valve device is provided in the relief passage and adapted to open when an internal pressure of the outlet passage becomes higher than that of the pressurizing chamber, thereby providing communication between the outlet passage and the pressurizing chamber. The relief valve includes a relief spring mechanism for pressing a relief valve to a relief valve seat. At least the relief spring mechanism among members of the relief valve device is provided outside the pressurizing chamber in the pump body. | 10-24-2013 |
20140134025 | AIR COMPRESSOR HAVING ENLARGED COMPARTMENT FOR RECEIVING PRESSURIZED AIR - An air compressor device includes a cylinder housing and a supporting plate, a piston engaged in the cylinder housing and moved by a motor, the cylinder housing includes a partition for separating the cylinder housing into an upper compartment and a lower chamber, and a passage formed in the partition for allowing the pressurized air to flow from the chamber into the compartment of the cylinder housing, the compartment of the cylinder housing includes an inner diameter (D) greater than an inner diameter (d) of the chamber of the cylinder housing for allowing the pressurized air in the chamber to easily flow into the compartment of the cylinder housing with a relatively decreased pressure. | 05-15-2014 |
20140193280 | HIGH-PRESSURE FUEL SUPPLY PUMP - The damper mechanism used for a high-pressure fuel supply pump system is configured so that an outer circumferential surface of a cover in regard to the thickness direction of the base material of the cover engages with the inner circumference of an open end part of a bottomed tubular concave part formed in a damper housing or in a pump housing of the high-pressure fuel supply pump. The total height of the damper as a low-pressure pulsation reducing mechanism can be reduced and the dimensions of the damper in the radial directions can also be reduced. In cases where the damper mechanism is formed integrally with the high-pressure fuel supply pump, the total height of the high-pressure fuel supply pump can be reduced and the dimensions of the damper part in the radial directions can also be reduced. | 07-10-2014 |
20140212315 | HYPERBOLIC HORN FOR PULSATION FILTER DEVICE USED WITH GAS COMPRESSOR - A method and system for reducing pulsation in a gas compressor system. A side branch absorber, which may be installed on the lateral piping of either the suction or discharge side of the cylinders, has a hyperbolic horn at the input end. The hyperbolic horn in series with an inlet reducer substantially increases the mass reactance of the resonator and substantially reduces the resonator frequency or the required cavity volume for target resonator frequency. The horn is hyperbolic in the sense that it has a large diameter at the first end tapers to a smaller diameter near the second end. | 07-31-2014 |
20140301876 | PISTON PUMP HAVING A HOLDER - A piston pump, in particular for a hydraulic assembly of an electronically controllable vehicle brake system, includes a cylinder element that has a pressure chamber with an outlet formed on the inside. The piston pump further includes an outlet-restricting element held on the outside of the cylinder element on a component by a first holder. | 10-09-2014 |
20150017040 | PULSATION DAMPER AND HIGH-PRESSURE PUMP HAVING THE SAME - A pulsation dumper configured to reduce a fuel pressure pulsation of fuel flowing in a fuel chamber includes a sealed space in which gas having a predetermined pressure is encapsulated between a first diaphragm and a second diaphragm configured to be resiliently deformable by a fuel pressure pulsation in the fuel chamber. A first resilient member provided in the sealed space abuts against an inner wall of the first diaphragm, and a second resilient member abuts against an inner wall of a second diaphragm. A supporting member provided between the first resilient member and the second resilient member supports an outer peripheral portion of the first resilient member and an outer peripheral portion of the second resilient member. A resonance of first and second diaphragms is restrained by the first and second resilient members. The first and second resilient members do not impair deformation of center portions of the first and second diaphragms. | 01-15-2015 |
20150017041 | Mechanism for Restraining Fuel Pressure Pulsation and High Pressure Fuel Supply Pump of Internal Combustion Engine with Such Mechanism - A mechanism for reducing pressure pulsation includes a pair of metal dampers formed by joining two disk-shaped metal diaphragms over an entire circumference and forming a hermetically sealed space inside a joined portion. Gas is sealed in the aforementioned hermetically sealed space of the damper, and a pair of pressing members give pressing forces to both outer surfaces of the aforementioned metal dampers at a position at an inner diameter side from the joined portion. The mechanism is unitized, with the pair of pressing members being connected in a state in which they sandwich the metal damper. | 01-15-2015 |
20160003399 | PULSATION DAMPER SUITABLE FOR HYGIENIC PROCESSING LINES - A pulsation damper configured to reduce pressure peaks in a pipe system. The pulsation damper comprises an elastic pipe section arranged to be in a small volume state or a large volume state. A first volume held in the elastic pipe section in the large volume state is greater than a second volume held in the elastic pipe section in the small volume state. The elastic pipe section has an elliptical cross section in the small volume state. A ratio between a major axis and a minor axis of the elastic pipe section is in the range 1.05 to 10.0, such as 1.1 to 1.5. | 01-07-2016 |
20160131120 | High-Pressure Fuel Pump - A high-pressure fuel pump includes a pump housing with a housing wall and a damping device configured to damp inlet-side pressure pulses by varying a damping volume with an elastically deformable wall. At least one section of the elastically deformable wall is formed from one or more of at least one part of a jacket-like area of the housing wall and at least one part of a sealing support. The section is embodied such that it includes at least one main part configured to vary the damping volume. | 05-12-2016 |
20160195080 | Hermetic Reciprocating Compressor for Mobile Application Provided With a Movement Limiting Assembly | 07-07-2016 |
417542000 | Inlet and discharge spaces | 2 |
20150292494 | IMPROVEMENTS IN AND RELATING TO VACUUM CONDUITS - In situations where a vacuum system is suddenly overloaded, there is a risk of mechanical damage being sustained, for example, bearing damage, gear slippage or rotor and/or stator collisions. Sudden overloads can also lead to electrical damage, for example, over-currents or power surges. Therefore a pressure regulating apparatus is provided for use in a vacuum pumping system having an inlet, an outlet and a conduit interposed between, and in fluid communication with, the inlet and the outlet, wherein the cross-sectional area of the conduit is greater than that required to meet the conductance requirements of the inlet and the outlet. | 10-15-2015 |
20160177936 | System and Method for Reducing at Least One of Airflow Turbulence and Pressure Fluctuation Proximate a Valve | 06-23-2016 |